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A065924
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Numbers n such that 1/n starts with n, after excluding leading zeros.
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0
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1, 3, 10, 100, 316, 1000, 3162, 10000, 100000, 1000000, 10000000, 100000000, 316227766, 1000000000, 3162277660, 10000000000, 100000000000, 1000000000000, 3162277660168, 10000000000000, 100000000000000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| All the terms are either 10^k or 10^k*sqrt(10) rounded down.
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EXAMPLE
| 316 is present because 1/316 = 0.00316..
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MAPLE
| with(numtheory);
P:=proc(i)
local a, b, c, n;
for n from 1 to i do
a:=1/n; b:=n; c:=0; while a<1 do a:=10*a; od;
while b>0 do c:=c+1; b:=trunc(b/10); od;
a:=trunc(10^(c-1)*a); if n=a then print(n); fi;
od;
end:
P(100000000000); # Paolo P. Lava, Dec 16 2011
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CROSSREFS
| Sequence in context: A073733 A005205 A181079 * A013233 A013226 A013231
Adjacent sequences: A065921 A065922 A065923 * A065925 A065926 A065927
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KEYWORD
| base,nonn
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AUTHOR
| Jonathan Ayres (jonathan.ayres(AT)btinternet.com), Nov 28 2001
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